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71.
Yu. A. Gorbatkina V. G. Ivanova-Mumjieva A. S. Putyatina T. M. Ul’yanova 《Mechanics of Composite Materials》2007,43(1):1-8
The concentration dependences of adhesive strength are investigated for fiber/dispersedly filled epoxy matrix systems. The
measurements were carried out using an improved model of adhesiometer under normal conditions at a constant rate of loading.
It is shown that the adhesive strength as a function of filler concentration has a maximum, which is more or less pronounced.
The location of the maximum depends on the nature of filler and particle geometry. The increase in the adhesive strength at
the maximum reaches 20–30% in comparison with that for the unfilled epoxy matrix. Since the interfacial strength between steel
wire and all the mineral powders investigated is zero, the growth in the adhesive strength upon introduction of a finely divided
filler in polymer binders is rather un expected. The possible reasons for the phenomenon observed are discussed.
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 43, No. 1, pp. 3–14, January–February, 2007. 相似文献
72.
Chromatography–mass spectrometry and thermodesorption mass spectrometry have been employed to study mineral schungite-III, in which various thiocompounds have been detected and identified. The influence of these compounds on the adsorption activity of schungite with respect to iodine has been investigated. It has been shown that sulfur present in schungite has no effect on the results of determining its adsorption activity and does not interact with iodine; however, it can interact with amino compounds to yield sulfides. Activation energies Ea have been experimentally determined for sulfur, iodine, and dimethyl disulfide desorption from the surfaces of schungite and a model sorbent, graphitized thermal carbon black. The Ea values of these compounds have appeared to be several times lower than the heats of their adsorption on carbon black calculated by the molecular-statistical method. 相似文献
73.
A. V. Ul’yanov I. G. Zenkevich I. A. Polunina K. E. Polunin A. K. Buryak 《Colloid Journal》2018,80(5):569-577
The interaction between asymmetric dimethylhydrazine and thiocontaining mineral schungite-III has been studied. Chromatography–mass spectrometry has been used to identify alkyl polysulfides as the products of desorption of asymmetric dimethylhydrazine from schungite surface. The interaction of asymmetric dimethylhydrazine with crystalline sulfur has been investigated in a model system. Dimethyl polysulfides, CH3SnCH3; (dimethylamino)methyl polysulfides, (CH3)2NSnCH3; and bis(dimethylamino) polysulfides, (CH3)2NSnN(CH3)2, with 2 ≤ n ≤ 4 have been detected. Gas-chromatographic retention indices have been determined for the products of the interaction of asymmetric dimethylhydrazine with sulfur and the schungite material. 相似文献
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78.
For abstract dynamical systems in the form of systems of motions, we obtain criteria for the preservation of stability properties
via an extended notion of a homomorphism of dynamical systems. We obtain corollaries for ordinary differential equations including
those with switchings of vector fields. We present examples illustrating the use of these criteria. 相似文献
79.
A. A. Abramov V. I. Ul’yanova L. F. Yukhno 《Computational Mathematics and Mathematical Physics》2008,48(7):1133-1139
Certain properties of the nonlinear self-adjoint eigenvalue problem for Hamiltonian systems of ordinary differential equations with singularities are examined. Under certain assumptions on the way in which the matrix of the system and the matrix specifying the boundary condition at a regular point depend on the spectral parameter, a numerical method is proposed for determining the number of eigenvalues lying on a prescribed interval of the spectral parameter. 相似文献
80.
A. A. Abramov V. I. Ul’yanova L. F. Yukhno 《Computational Mathematics and Mathematical Physics》2008,48(6):942-945
The nonlinear self-adjoint eigenvalue problem for a Hamiltonian system of two ordinary differential equations is examined under the assumption that the matrix of the system is a monotone function of the spectral parameter. Certain properties of eigenvalues that were previously established by the authors for Hamitonian systems of arbitrary order are now worked out in detail and made more precise for the above system. In particular, a single second-order ordinary differential equation is analyzed. 相似文献